--- tcl8.6.0.org/generic/tcl.h
+++ tcl8.6.0/generic/tcl.h
@@ -17,6 +17,8 @@
 #ifndef _TCL
 #define _TCL
 
+#include <sys/stat.h>
+
 /*
  * For C++ compilers, use extern "C"
  */
